So a couple hours ago I dumped 20 cups into 40 gallons of water. Fritz says 1/2 cup per gallon. I go to check salinity and my hanna says 2.3 ppt. I was slightly confused by this so I dip the hanna into my frag tank. Sure enough 35ppt on the nose. Check my mix again and it's 2.3. Check with my refractometer and it's barely showing above 1.000. What the eff is going on here?